H. B.  Preston, ?Descriptions of new species of land, marine and freshwater shells from the Andaman Islands.?, Records of the Indian Museum, vol. 2, pp. 187-210, pls.14-17, 1908.

W. H.  Dall, ?Reports on the dredging operations off the west coast of Central America to the Galapagos 1891, xxxviii. Report on the scientific results of the expedition to the eastern tropical Pacific October, 1904 to March, 1905, xiv. The Mollusca and Brachiopoda.?, Bulletin of the Museum of Comparative Zoology at Harvard College, vol. 43, pp. 205-487, 1908.